Phlogiston?

The image was acquired as a part of Hi-GAL, a survey mapping the entire plane of the Milky Way in a wide range of infrared light that Herschel was specially designed to detect. The image above is just a small section of a larger version, which in itself is just 1/30th of the entire Hi-GAL survey. For the science of how this was done, click on the image.

Here’s the rainbow river in full. Click on the picture for the larger image.